CHICAGO—Injuries continued to mount for the Chicago Bears in Sunday's 23-17 overtime loss to the Seattle Seahawks, and this time the defense is taking a big hit.

Middle linebacker Brian Urlacher went out in overtime with a pulled hamstring and cornerback Tim Jennings suffered a shoulder injury. Neither could finish the game.

Brian Urlacher injury update: The Bears' man in the middle left Sunday's game in OT. (AP Photo)

Nick Roach moves into the middle in Urlacher's absence and Kelvin Hayden plays for Jennings.

Both injuries could be a day-to-day situation and will be evaluated further Monday. But 34-year-old linebackers usually don't heal quickly from a hamstring injury. Urlacher suffered one when he was younger that wiped out his entire preseason. The Bears are 7-15 when Urlacher can't start due to injury.

A bigger injury may be the one to wide receiver Earl Bennett, who suffered a concussion. It first appeared to happen on the final play of the first half while he was returning a kick, but later it was suggested in the Bears' locker room by players that it may have happened when Bennett scored a touchdown on a 12-yard first-quarter pass from Jay Cutler, as he was flipped into the air and landed on his head. That would have meant Bennett played hurt the rest of the half. He later dropped a 62-yard touchdown pass from Cutler after the TD catch, but before the kickoff return.

"I don't know if he was feeling the effects of that hit down by the goal line or not. It's hard to tell," Cutler said.

Losing Bennett is tough because the Bears had already lost starter Devin Hester last week with a concussion. Hester's backup, Alshon Jeffery, is still mending after arthroscopic knee surgery. So Bennett and Eric Weems replaced Hester. The Bears' offense is without a great deal of its speed with Hester and Jeffery out, and defenses will tend to sit on the shorter routes against them.

Brandon Marshall offered up a couple alternatives after the game by suggesting either practice squad player Joe Anderson, or Marshall's own good friend, free agent Michael Sims-Walker, would be options.

"It doesn't matter if it's Mike Sims-Walker that's on the street right now that's hungry, or Joe Anderson who's hungry right now," Marshall said. "We definitely will make the right decisions and move forward."